Bassoon, C#3
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Add one or more of the following to stabilize pitch: L. H. D key or Eb key or Db key. R. H. F key or Ab key (little finger or thumb) or little finger F# key.
From the Bassoon-Family Fingering Companion by Terry B. Ewell - McAuliffe, Joseph. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 64.